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I am interested in this. Would you please give your answer in English also? I tried Google translate but it doesn't make sense:

In your project you create 2 connections. conn_login and conn_apps (for example)
Your apps are connected to conn_apps and login use conn_login

You configure conn_login to use a database that will be used as entry point. In your users table, you add fields related to database for every user (database name for example).
Modify your login app (if you use SC security module) to retrieve too this new field. On succesfull login, before redirection, you use sc_edit_connection to modify conn_apps with params needed.